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WO2014013614A1 - Control device - Google Patents

Control device Download PDF

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Publication number
WO2014013614A1
WO2014013614A1 PCT/JP2012/068477 JP2012068477W WO2014013614A1 WO 2014013614 A1 WO2014013614 A1 WO 2014013614A1 JP 2012068477 W JP2012068477 W JP 2012068477W WO 2014013614 A1 WO2014013614 A1 WO 2014013614A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
power converter
disconnection
detection unit
current
Prior art date
Application number
PCT/JP2012/068477
Other languages
French (fr)
Japanese (ja)
Inventor
庸泰 柿崎
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to DE112012006581.6T priority Critical patent/DE112012006581T5/en
Priority to JP2013504042A priority patent/JP5296942B1/en
Priority to US14/415,303 priority patent/US9793843B2/en
Priority to PCT/JP2012/068477 priority patent/WO2014013614A1/en
Publication of WO2014013614A1 publication Critical patent/WO2014013614A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/50—Vector control arrangements or methods not otherwise provided for in H02P21/00- H02P21/36
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/0243—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being a broken phase
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/12—Monitoring commutation; Providing indication of commutation failure
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
    • H02M7/53876—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/06—Rotor flux based control involving the use of rotor position or rotor speed sensors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P31/00—Arrangements for regulating or controlling electric motors not provided for in groups H02P1/00 - H02P5/00, H02P7/00 or H02P21/00 - H02P29/00

Definitions

  • the present invention relates to a control device that controls a power converter that converts electric power to drive an electric motor, and detects a disconnection between the power converter and the electric motor.
  • An electric vehicle travels by converting electric power taken from an overhead line by a current collector with a power converter and driving an electric motor with the converted power.
  • a disconnection occurs between the power converter and the electric motor, electric power cannot be supplied to the electric motor, and the traction force of the electric vehicle is lost.
  • one power converter supplies power to a plurality of motors, if the power converter continues to operate in a state where a disconnection has occurred between the power converter and one motor, the power converter is applied to the other motors.
  • the voltage may increase, overloading other motors may cause the motors to break down. Therefore, it is necessary to detect the disconnection that occurs between the power converter and the electric motor.
  • the drive control device disclosed in Patent Literature 1 calculates an average value of three-phase currents output to the electric motor by the drive control device, and when the difference between the average value and each phase current exceeds a predetermined value, It is determined that the cable for supplying the phase current is disconnected.
  • the power conversion device disclosed in Patent Document 2 includes a power converter, an electric motor, and a motor when the fluctuation of the output current of the power converter exceeds a predetermined value and the minimum value of the output current is lower than a predetermined value. It is determined that a disconnection has occurred between the two.
  • the electric vehicle control device disclosed in Patent Document 3 determines that a disconnection has occurred between the power converter and the electric motor when the torque fluctuation of the electric motor exceeds a predetermined value.
  • the electric motor drive device disclosed in Patent Document 4 determines whether or not a disconnection occurs between the output circuit and the electric motor based on each phase voltage output by the output circuit within a predetermined time after activation.
  • the electric vehicle control device disclosed in Patent Document 3 requires a torque calculation circuit, which complicates the circuit.
  • the electric motor drive device disclosed in Patent Document 4 requires a monitor for detecting the voltage supplied to the electric motor, which complicates the circuit. With the technique disclosed in Patent Document 5, a disconnection cannot be detected after the motor is started.
  • the present invention has been made in view of the circumstances as described above, and an object thereof is to improve the detection accuracy of disconnection between a power converter and an electric motor with a simple configuration.
  • the control device of the present invention includes a power converter, a current detection unit, a voltage control unit, a disconnection detection unit, and a gate control unit.
  • the power converter converts the input power by switching on and off of the switching element, and drives the AC motor.
  • the current detection unit detects a current output from the power converter to the AC motor.
  • a voltage control part produces
  • the disconnection detection unit determines that a disconnection has occurred between the power converter and the AC motor when the state where the absolute value of the combined vector of the voltage command values is not within the predetermined range continues for a predetermined time or longer.
  • the gate control unit outputs a gate command for controlling on / off switching of the switching element included in the power converter based on the voltage command value.
  • FIG. 1 is a block diagram showing a configuration example of a control device according to an embodiment of the present invention.
  • FIG. 1 shows an example in which the control device 1 is used for a train.
  • the control device 1 takes in power from the overhead line 2 by the current collector 3, converts the power, and drives the AC motor 4 with the converted power.
  • the AC motor 4 is an electric motor that generates a driving force for running the vehicle.
  • a three-phase induction motor is used as the AC motor 4.
  • the control device 1 includes a power converter 11, current detection units 12a, 12b, and 12c, a voltage control unit 13, a disconnection detection unit 14, and a gate control unit 15.
  • the power converter 11 converts the taken-in power into three-phase AC power supplied to the AC motor 4 by switching on and off of the switching element based on the gate command GATE output from the gate control unit 15, and the AC motor 4 is driven.
  • the current detection units 12 a, 12 b, and 12 c detect the phase currents Iu, Iv, and Iw that the power converter 11 supplies to the AC motor 4, and send them to the voltage control unit 13.
  • the current detection units 12 a, 12 b, and 12 c are not limited to CT (Current Transformer) that detects a current flowing in the connection between the power converter 11 and the AC motor 4.
  • the current detection unit 12c may be omitted, and the phase current Iw may be calculated from the phase currents Iu and Iv detected by the current detection units 12a and 12b, respectively.
  • the voltage control unit 13 is input with an operation command signal S1 for commanding the rotational operation of the AC motor 4. Based on the operation command signal S1, for example, the angular velocity and the output torque of the AC motor 4 are determined.
  • the angular speed of the AC motor 4 is the angular speed of the rotor of the AC motor 4.
  • the driving command signal S1 is a signal for controlling the running of the vehicle, and is a powering command signal and a brake command signal that are command signals from the cab. including.
  • the signal levels of the power running command signal and the brake command signal change depending on the input or release of the power running command and the brake command in the cab.
  • the voltage control unit 13 generates the d-axis current command value Id * and the q-axis current command value Iq * on the rotation coordinates based on the operation command signal S1 using the conventional technique.
  • the voltage control unit 13 performs coordinate conversion from the drive coordinates, which are the determined coordinates for driving the AC motor 4, to the rotation coordinates for the phase currents Iu, Iv, and Iw using the conventional technique, D-axis current Id and q-axis current Iq are generated.
  • the rotation coordinates are coordinates that rotate in synchronization with a rotating magnetic field generated in the AC motor 4.
  • the d-axis is in the same direction as the main magnetic flux of the rotating magnetic field, and the q-axis is the direction orthogonal to the d-axis.
  • the drive coordinates are coordinates having a U-phase axis, a V-phase axis, and a W-phase axis.
  • the voltage control unit 13 determines the deviation between the d-axis current command value Id * and the d-axis current Id and The d-axis voltage command value Vd * and the q-axis voltage command value Vq * are generated so as to eliminate the deviation between the q-axis current command value Iq * and the q-axis current Iq, and sent to the disconnection detection unit 14 and the gate control unit 15. .
  • the disconnection detector 14 is input with a driving command signal S1 and a speed signal S2 that is a signal indicating the speed of the vehicle.
  • a speed signal S2 for example, the vehicle speed based on the angular speed detected by the angular speed sensor attached to the AC motor 4 and the speed information of ATC (Automatic Train Control) can be used.
  • the angular speed of the AC motor 4 is calculated, and the vehicle is calculated from the angular speed.
  • a speed calculation unit that calculates a speed may be provided, and the speed calculated by the speed calculation unit may be sent to the disconnection detection unit 14 as a speed signal S2.
  • the speed signal S2 may be an angular speed detected by the angular speed sensor or an angular speed calculated as described above, and the disconnection detection unit 14 may calculate the vehicle speed from the angular speed.
  • the disconnection detection unit 14 It is determined that a disconnection has occurred with the electric motor 4.
  • the predetermined range is a function of the speed of the vehicle, for example.
  • the predetermined time is an arbitrary time provided to prevent erroneous detection of disconnection due to fluctuations in the d-axis voltage command value Vd * and the q-axis voltage command value Vq *.
  • the disconnection detection unit 14 sends a disconnection signal OFF to the gate control unit 15.
  • the disconnection signal OFF is H (High) level when the disconnection detection unit 14 determines that a disconnection occurs between the power converter 11 and the AC motor 4. This is a signal that is at the L (Low) level when it is determined that no disconnection has occurred.
  • the gate control unit 15 switches the switching element included in the power converter 11 on and off based on the d-axis voltage command value Vd * and the q-axis voltage command value Vq *. Is sent to the power converter 11.
  • the gate control unit 15 sends a gate command GATE for turning off the switching element included in the power converter 11 to the power converter 11. By turning off the switching element included in the power converter 11, the power supply to the AC motor 4 is stopped, and it is possible to prevent the AC motor 4 from being overloaded.
  • FIG. 2 is a diagram illustrating a relationship between the motor voltage and the motor current in the embodiment.
  • the absolute value of the combined vector of the U-phase, V-phase, and W-phase voltages is called a motor voltage.
  • the absolute value of the combined vector of the phase currents Iu, Iv, and Iw is called a motor current. Since the actual motor voltage cannot be detected, the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * is regarded as the motor voltage.
  • the motor current is kept constant, and when the vehicle speed exceeds a certain speed, it gradually decreases as the vehicle speed increases.
  • the motor voltage gradually increases and is kept constant when the limit voltage is reached.
  • the limit voltage is a value determined by the maximum value of the voltage that can be output by the power converter 11.
  • FIG. 3 is a diagram illustrating an example of a predetermined range of absolute values of a combined vector of voltage command values in the embodiment. A range that is equal to or less than the value indicated by the solid line in FIG.
  • the current detection unit 12 a detects it.
  • the phase current Iu temporarily decreases. Since control device 1 performs vector control so that the current supplied to AC motor 4 is constant, the values of d-axis voltage command value Vd * and q-axis voltage command value Vq * increase. Thereafter, when the state where the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * is not within a predetermined range continues for a predetermined time or longer, the disconnection detection unit 14 is connected to the power converter 11. It is determined that a disconnection has occurred with the AC motor 4.
  • the disconnection detection unit 14 determines that no disconnection has occurred between the power converter 11 and the AC motor 4. As indicated by white circles in FIG. 3, when the vehicle speed is V2 and the motor voltage is Vm2, the motor voltage is not within a predetermined range. When this state continues for a predetermined time or more, the disconnection detection unit 14 determines that a disconnection has occurred between the power converter 11 and the AC motor 4.
  • the upper limit value of the predetermined range is, for example, a value obtained by multiplying a constant in the motor voltage when there is no disconnection indicated by a dotted line in FIG. Further, the upper limit value of the predetermined range may be defined so that the difference between the upper limit value of the predetermined range and the motor voltage at the time of disconnection increases at a constant rate as the vehicle speed increases.
  • the disconnection detector 14 determines whether or not the power converter 11 and the AC motor 4 are disconnected based on the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq *. Therefore, even when the cables of all the phases of one AC motor 4 are disconnected, it is possible to detect the disconnection.
  • the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * becomes 0, so that 0 in a predetermined range. In such a case, it is possible to detect a disconnection.
  • a predetermined range may be defined for each operation command.
  • FIG. 4 is a diagram illustrating an example of a predetermined range corresponding to the operation command in the embodiment.
  • the operation command signal S1 includes, for example, a stepless power running command signal and a stepped power running command signal.
  • the one-dot chain line graph is the upper limit value of the predetermined range when the operation command signal S1 is the pattern 1
  • the two-dot chain line graph is the upper limit value of the predetermined range when the operation command signal S1 is the pattern 2 It is.
  • the vehicle speed is V3
  • the motor voltage is Vm3
  • the disconnection detection unit 14 indicates that there is no disconnection between the power converter 11 and the AC motor 4. to decide.
  • the disconnection detection unit 14 has a disconnection between the power converter 11 and the AC motor 4.
  • control device 1 According to the control device 1 according to the present embodiment, it is possible to improve the detection accuracy of the disconnection between the power converter and the electric motor with a simple configuration.
  • the disconnection detection unit 14 may be configured not to use the operation command signal S1. In that case, when the state where the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * is not within the predetermined range is continued for a predetermined time or more regardless of the type of operation command signal. In addition, it is determined that the power converter 11 and the AC motor 4 are disconnected.
  • the disconnection detection unit 14 is configured to output a disconnection signal OFF to the outside of the control device 1 instead of the gate control unit 15 when it is determined that the disconnection has occurred between the power converter 11 and the AC motor 4. May be.
  • a disconnection signal OFF may be sent to the display device of the cab and the driver may be notified that the power converter 11 and the AC motor 4 are disconnected.
  • AC motor 4 is not limited to a three-phase induction motor, and may be a single-phase induction motor. Further, the AC motor 4 is not limited to a plurality, and may be one. The AC motor 4 may be an induction motor or a rotary motor. Further, instead of the AC motor 4, a linear induction motor, a linear synchronous motor, a solenoid, or the like may be used.
  • AC motor 4 driven by control device 1 is not limited to an electric motor that generates a driving force for running a vehicle.
  • the predetermined range may be a function of the angular speed of the AC motor 4 instead of a function of the speed of the vehicle.
  • the speed signal S ⁇ b> 2 input to the disconnection detection unit 14 is the angular speed of the AC motor 4.
  • the disconnection detection unit 14 continues the state where the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * is not within a predetermined range that is a function of the angular velocity of the AC motor 4 for a predetermined time or longer. In this case, it is determined that the power converter 11 and the AC motor 4 are disconnected.
  • the present invention can be suitably employed in a control device that controls a power converter that converts electric power to drive an electric motor and detects a disconnection between the power converter and the electric motor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Multiple Motors (AREA)

Abstract

A voltage control unit (13) generates a d-axis voltage command value and a q-axis voltage command value on the basis of an operation command signal and a three-phase current. When the state in which the absolute value of the resultant vector of the d-axis voltage command value and the q-axis voltage command value is not within a set predetermined range continues for a predetermined time or longer, a disconnection detection unit (14) determines that disconnection occurs between a power converter (11) and an alternating-current motor (4). A gate control unit (15) transmits a gate command for turning off a switching element provided in the power converter (11) to the power converter (11) when the disconnection detection unit (14) determines that the disconnection occurs between the power converter (11) and the alternating-current motor (4).

Description

制御装置Control device
　この発明は、電動機を駆動するために電力を変換する電力変換器を制御し、電力変換器と電動機との間の断線を検知する制御装置に関する。 The present invention relates to a control device that controls a power converter that converts electric power to drive an electric motor, and detects a disconnection between the power converter and the electric motor.
　電気車は、集電装置により架線から取り入れた電力を電力変換器で変換し、変換した電力で電動機を駆動させて走行する。電力変換器と電動機との間で断線が生じた場合には、電動機に電力を供給することができなくなるため、電気車の牽引力が失われる。また１つの電力変換器が複数の電動機に電力を供給する場合に、電力変換器と１つの電動機との間で断線が生じた状態で電力変換器が作動し続けると、他の電動機に印加される電圧が上昇し、他の電動機に過負荷がかかって電動機が故障する恐れがある。そこで電力変換器と電動機との間で生じた断線を検知する必要がある。 An electric vehicle travels by converting electric power taken from an overhead line by a current collector with a power converter and driving an electric motor with the converted power. When a disconnection occurs between the power converter and the electric motor, electric power cannot be supplied to the electric motor, and the traction force of the electric vehicle is lost. In addition, when one power converter supplies power to a plurality of motors, if the power converter continues to operate in a state where a disconnection has occurred between the power converter and one motor, the power converter is applied to the other motors. The voltage may increase, overloading other motors may cause the motors to break down. Therefore, it is necessary to detect the disconnection that occurs between the power converter and the electric motor.
　特許文献１に開示される駆動制御装置は、駆動制御装置が電動機へ出力する三相電流の平均値を算出し、平均値とそれぞれの相電流との差が定めた値を超えた場合に、その相電流を供給するためのケーブルが断線していると判断する。特許文献２に開示される電力変換装置は、電力変換器の出力電流の変動が定めた値を超え、かつ、該出力電流の最小値が定めた値を下回る場合に、電力変換器と電動機との間で断線が生じていると判断する。 The drive control device disclosed in Patent Literature 1 calculates an average value of three-phase currents output to the electric motor by the drive control device, and when the difference between the average value and each phase current exceeds a predetermined value, It is determined that the cable for supplying the phase current is disconnected. The power conversion device disclosed in Patent Document 2 includes a power converter, an electric motor, and a motor when the fluctuation of the output current of the power converter exceeds a predetermined value and the minimum value of the output current is lower than a predetermined value. It is determined that a disconnection has occurred between the two.
　特許文献３に開示される電気車制御装置は、電動機のトルクの変動が定めた値を超えた場合に、電力変換器と電動機との間で断線が生じていると判断する。特許文献４に開示される電動機駆動装置は、起動後の定めた時間内における出力回路が出力する各相電圧に基づき、出力回路と電動機との間で断線が生じているか否かを判断する。特許文献５に開示される技術では、電動機の始動前に、電力変換器の各相のアームの中点電圧に基づき、各相のアームと電動機との間で断線が生じているか否かを判断する。 The electric vehicle control device disclosed in Patent Document 3 determines that a disconnection has occurred between the power converter and the electric motor when the torque fluctuation of the electric motor exceeds a predetermined value. The electric motor drive device disclosed in Patent Document 4 determines whether or not a disconnection occurs between the output circuit and the electric motor based on each phase voltage output by the output circuit within a predetermined time after activation. In the technique disclosed in Patent Document 5, it is determined whether or not a disconnection has occurred between each phase arm and the electric motor based on the midpoint voltage of each phase arm of the power converter before starting the electric motor. To do.
特開平６－２４５３０１号公報JP-A-6-245301 特開２００３－３０４６３４号公報JP 2003-304634 A 特開２００５－１７６５７１号公報JP 2005-176571 A 特開２００６－５０７０７号公報JP 2006-50707 A 特開２０１０－２３３３４３号公報JP 2010-233343 A
　特許文献１に開示される駆動制御装置は、三相全てのケーブルが断線している場合には、三相電流の対称性が失われず、三相電流の平均値と各相電流との差が定めた値を超えないため、断線を検知することができない。同様に、特許文献２に開示される電力変換装置は、三相全てのケーブルが断線している場合には、電力変換器の出力電流の変動が定めた値を超えないため、断線を検知することができない。 In the drive control device disclosed in Patent Document 1, when all three-phase cables are disconnected, the symmetry of the three-phase current is not lost, and the difference between the average value of the three-phase current and each phase current is Since the specified value is not exceeded, disconnection cannot be detected. Similarly, the power conversion device disclosed in Patent Document 2 detects disconnection when all three-phase cables are disconnected, because the fluctuation in the output current of the power converter does not exceed a predetermined value. I can't.
　特許文献３に開示される電気車制御装置ではトルク演算回路が必要であり、回路が複雑化する。同様に、特許文献４に開示される電動機駆動装置は、電動機に供給される電圧を検出するモニタが必要であり、回路が複雑化する。特許文献５に開示される技術では、電動機の始動後に断線を検知することができない。 The electric vehicle control device disclosed in Patent Document 3 requires a torque calculation circuit, which complicates the circuit. Similarly, the electric motor drive device disclosed in Patent Document 4 requires a monitor for detecting the voltage supplied to the electric motor, which complicates the circuit. With the technique disclosed in Patent Document 5, a disconnection cannot be detected after the motor is started.
　本発明は、上述のような事情に鑑みてなされたものであり、簡易な構成で電力変換器と電動機との間における断線の検知精度を向上させることを目的とする。 The present invention has been made in view of the circumstances as described above, and an object thereof is to improve the detection accuracy of disconnection between a power converter and an electric motor with a simple configuration.
　上記目的を達成するために、本発明の制御装置は、電力変換器、電流検出部、電圧制御部、断線検知部、およびゲート制御部を備える。電力変換器は、スイッチング素子のオンとオフを切り替えることにより、入力された電力を変換し、交流電動機を駆動する。電流検出部は、電力変換器が交流電動機に対して出力する電流を検出する。電圧制御部は、交流電動機の回転動作を指令する運転指令および電流検出部が検出した電流に基づき、電力変換器の制御に用いる電圧指令値を生成する。断線検知部は、電圧指令値の合成ベクトルの絶対値が所定範囲にない状態が、所定時間以上継続した場合には、電力変換器と交流電動機との間で断線が生じていると判断する。ゲート制御部は、電圧指令値に基づき、電力変換器が備えるスイッチング素子のオンとオフの切り替えを制御するゲート指令を出力する。 In order to achieve the above object, the control device of the present invention includes a power converter, a current detection unit, a voltage control unit, a disconnection detection unit, and a gate control unit. The power converter converts the input power by switching on and off of the switching element, and drives the AC motor. The current detection unit detects a current output from the power converter to the AC motor. A voltage control part produces | generates the voltage command value used for control of a power converter based on the driving | operation instruction | command which commands rotation operation of an AC motor, and the electric current which the electric current detection part detected. The disconnection detection unit determines that a disconnection has occurred between the power converter and the AC motor when the state where the absolute value of the combined vector of the voltage command values is not within the predetermined range continues for a predetermined time or longer. The gate control unit outputs a gate command for controlling on / off switching of the switching element included in the power converter based on the voltage command value.
　本発明によれば、簡易な構成で電力変換器と電動機との間における断線の検知精度を向上させることが可能となる。 According to the present invention, it is possible to improve the detection accuracy of the disconnection between the power converter and the electric motor with a simple configuration.
本発明の実施の形態に係る制御装置の構成例を示すブロック図である。It is a block diagram which shows the structural example of the control apparatus which concerns on embodiment of this invention. 実施の形態におけるモータ電圧とモータ電流との関係を示す図である。It is a figure which shows the relationship between the motor voltage and motor current in embodiment. 実施の形態における電圧指令値の合成ベクトルの絶対値の所定範囲の例を示す図である。It is a figure which shows the example of the predetermined range of the absolute value of the synthetic | combination vector of the voltage command value in embodiment. 実施の形態における運転指令に対応する所定範囲の例を示す図である。It is a figure which shows the example of the predetermined range corresponding to the driving | operation command in embodiment.
　以下、本発明の実施の形態について図面を参照して詳細に説明する。なお図中、同一または同等の部分には同一の符号を付す。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are denoted by the same reference numerals.
　図１は、本発明の実施の形態に係る制御装置の構成例を示すブロック図である。図１は、制御装置１を電車に用いた例である。制御装置１は、架線２から集電装置３によって電力を取り入れ、電力を変換し、変換した電力で交流電動機４を駆動する。交流電動機４は、車両を走行させる駆動力を生じる電動機である。図１の例においては、交流電動機４として三相誘導電動機を用いる。制御装置１は、電力変換器１１、電流検出部１２ａ、１２ｂ、１２ｃ、電圧制御部１３、断線検知部１４およびゲート制御部１５を備える。 FIG. 1 is a block diagram showing a configuration example of a control device according to an embodiment of the present invention. FIG. 1 shows an example in which the control device 1 is used for a train. The control device 1 takes in power from the overhead line 2 by the current collector 3, converts the power, and drives the AC motor 4 with the converted power. The AC motor 4 is an electric motor that generates a driving force for running the vehicle. In the example of FIG. 1, a three-phase induction motor is used as the AC motor 4. The control device 1 includes a power converter 11, current detection units 12a, 12b, and 12c, a voltage control unit 13, a disconnection detection unit 14, and a gate control unit 15.
　電力変換器１１は、ゲート制御部１５が出力するゲート指令ＧＡＴＥに基づいてスイッチング素子のオンとオフを切り替えることにより、取り入れた電力を交流電動機４に供給する三相交流電力に変換し、交流電動機４を駆動する。電流検出部１２ａ、１２ｂ、１２ｃは、それぞれ電力変換器１１が交流電動機４に供給する相電流Ｉｕ、Ｉｖ、Ｉｗを検出し、電圧制御部１３に送る。電流検出部１２ａ、１２ｂ、１２ｃは、電力変換器１１と交流電動機４との結線に流れる電流を検出するＣＴ（Current Transformer）に限られない。また相電流はＩｕ＋Ｉｖ＋Ｉｗ＝０という関係を満たすので、例えば電流検出部１２ｃを省略し、電流検出部１２ａ、１２ｂがそれぞれ検出した相電流Ｉｕ、Ｉｖから相電流Ｉｗを算出してもよい。 The power converter 11 converts the taken-in power into three-phase AC power supplied to the AC motor 4 by switching on and off of the switching element based on the gate command GATE output from the gate control unit 15, and the AC motor 4 is driven. The current detection units 12 a, 12 b, and 12 c detect the phase currents Iu, Iv, and Iw that the power converter 11 supplies to the AC motor 4, and send them to the voltage control unit 13. The current detection units 12 a, 12 b, and 12 c are not limited to CT (Current Transformer) that detects a current flowing in the connection between the power converter 11 and the AC motor 4. Since the phase current satisfies the relationship Iu + Iv + Iw = 0, for example, the current detection unit 12c may be omitted, and the phase current Iw may be calculated from the phase currents Iu and Iv detected by the current detection units 12a and 12b, respectively.
　電圧制御部１３には、交流電動機４の回転動作を指令する運転指令信号Ｓ１が入力される。運転指令信号Ｓ１に基づき、例えば交流電動機４の角速度や出力トルクが決定される。交流電動機４の角速度とは、交流電動機４の回転子の角速度である。図１のように制御装置１を電車に用いる場合には、運転指令信号Ｓ１は、車両の走行を制御するための信号であって、運転台からの指令信号である力行指令信号およびブレーキ指令信号を含む。力行指令信号およびブレーキ指令信号は、運転台における力行指令およびブレーキ指令の入力または解除によりそれぞれ信号レベルが変化する。 The voltage control unit 13 is input with an operation command signal S1 for commanding the rotational operation of the AC motor 4. Based on the operation command signal S1, for example, the angular velocity and the output torque of the AC motor 4 are determined. The angular speed of the AC motor 4 is the angular speed of the rotor of the AC motor 4. When the control device 1 is used for a train as shown in FIG. 1, the driving command signal S1 is a signal for controlling the running of the vehicle, and is a powering command signal and a brake command signal that are command signals from the cab. including. The signal levels of the power running command signal and the brake command signal change depending on the input or release of the power running command and the brake command in the cab.
　電圧制御部１３は、従来技術を用いて、運転指令信号Ｓ１に基づき、回転座標上のｄ軸電流指令値Ｉｄ＊およびｑ軸電流指令値Ｉｑ＊を生成する。また電圧制御部１３は、従来技術を用いて、相電流Ｉｕ、Ｉｖ、Ｉｗについて、交流電動機４を駆動するための定めた座標である駆動座標から回転座標への座標変換を行い、回転座標上のｄ軸電流Ｉｄおよびｑ軸電流Ｉｑを生成する。回転座標とは、交流電動機４において生じる回転磁界に同期して回転する座標である。ｄ軸は回転磁界の主磁束と同方向であり、ｑ軸はｄ軸に直交する方向である。交流電動機４が三相誘導電動機である場合は、駆動座標は、Ｕ相軸、Ｖ相軸およびＷ相軸を有する座標である。 The voltage control unit 13 generates the d-axis current command value Id * and the q-axis current command value Iq * on the rotation coordinates based on the operation command signal S1 using the conventional technique. In addition, the voltage control unit 13 performs coordinate conversion from the drive coordinates, which are the determined coordinates for driving the AC motor 4, to the rotation coordinates for the phase currents Iu, Iv, and Iw using the conventional technique, D-axis current Id and q-axis current Iq are generated. The rotation coordinates are coordinates that rotate in synchronization with a rotating magnetic field generated in the AC motor 4. The d-axis is in the same direction as the main magnetic flux of the rotating magnetic field, and the q-axis is the direction orthogonal to the d-axis. When AC motor 4 is a three-phase induction motor, the drive coordinates are coordinates having a U-phase axis, a V-phase axis, and a W-phase axis.
　電圧制御部１３は、ｄ軸電流指令値Ｉｄ＊、ｑ軸電流指令値Ｉｑ＊、ｄ軸電流Ｉｄおよびｑ軸電流Ｉｑに基づき、ｄ軸電流指令値Ｉｄ＊とｄ軸電流Ｉｄとの偏差およびｑ軸電流指令値Ｉｑ＊とｑ軸電流Ｉｑとの偏差がなくなるように、ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊を生成し、断線検知部１４およびゲート制御部１５に送る。 Based on the d-axis current command value Id *, the q-axis current command value Iq *, the d-axis current Id, and the q-axis current Iq, the voltage control unit 13 determines the deviation between the d-axis current command value Id * and the d-axis current Id and The d-axis voltage command value Vd * and the q-axis voltage command value Vq * are generated so as to eliminate the deviation between the q-axis current command value Iq * and the q-axis current Iq, and sent to the disconnection detection unit 14 and the gate control unit 15. .
　断線検知部１４には、運転指令信号Ｓ１および車両の速度を示す信号である速度信号Ｓ２が入力される。速度信号Ｓ２には、例えば交流電動機４に取り付けた角速度センサが検出した角速度に基づく車両速度、ＡＴＣ（Automatic Train Control：自動列車制御装置）の速度情報を用いることができる。またｄ軸電圧指令値Ｖｄ＊、ｑ軸電圧指令値Ｖｑ＊、ｄ軸電流Ｉｄ、ｑ軸電流Ｉｑ、および交流電動機４の一次抵抗値に基づき、交流電動機４の角速度を算出し、角速度から車両速度を算出する速度算出部を設け、速度算出部が算出する速度を速度信号Ｓ２として断線検知部１４に送るよう構成してもよい。また速度信号Ｓ２を、角速度センサが検出した角速度または上述のように算出した角速度とし、断線検知部１４が角速度から車両速度を算出するよう構成してもよい。 The disconnection detector 14 is input with a driving command signal S1 and a speed signal S2 that is a signal indicating the speed of the vehicle. As the speed signal S2, for example, the vehicle speed based on the angular speed detected by the angular speed sensor attached to the AC motor 4 and the speed information of ATC (Automatic Train Control) can be used. Further, based on the d-axis voltage command value Vd *, the q-axis voltage command value Vq *, the d-axis current Id, the q-axis current Iq, and the primary resistance value of the AC motor 4, the angular speed of the AC motor 4 is calculated, and the vehicle is calculated from the angular speed. A speed calculation unit that calculates a speed may be provided, and the speed calculated by the speed calculation unit may be sent to the disconnection detection unit 14 as a speed signal S2. Alternatively, the speed signal S2 may be an angular speed detected by the angular speed sensor or an angular speed calculated as described above, and the disconnection detection unit 14 may calculate the vehicle speed from the angular speed.
　断線検知部１４は、ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊の合成ベクトルの絶対値が所定範囲にない状態が、所定時間以上継続した場合には、電力変換器１１と交流電動機４との間で断線が生じていると判断する。所定範囲は、例えば車両の速度の関数である。所定時間は、ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊の変動による断線の誤検知を防止するために設けられた任意の時間である。 When the state where the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * is not within the predetermined range continues for a predetermined time or longer, the disconnection detection unit 14 It is determined that a disconnection has occurred with the electric motor 4. The predetermined range is a function of the speed of the vehicle, for example. The predetermined time is an arbitrary time provided to prevent erroneous detection of disconnection due to fluctuations in the d-axis voltage command value Vd * and the q-axis voltage command value Vq *.
　断線検知部１４は、ゲート制御部１５に断線信号ＯＦＦを送る。例えば断線信号ＯＦＦは、断線検知部１４が電力変換器１１と交流電動機４との間で断線が生じていると判断した場合にＨ（High）レベルであり、電力変換器１１と交流電動機４との間で断線が生じていないと判断した場合にＬ（Low）レベルである信号である。 The disconnection detection unit 14 sends a disconnection signal OFF to the gate control unit 15. For example, the disconnection signal OFF is H (High) level when the disconnection detection unit 14 determines that a disconnection occurs between the power converter 11 and the AC motor 4. This is a signal that is at the L (Low) level when it is determined that no disconnection has occurred.
　ゲート制御部１５は、断線信号ＯＦＦがＬレベルである場合には、ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊に基づき、電力変換器１１が備えるスイッチング素子のオンとオフの切り替えを制御するゲート指令ＧＡＴＥを電力変換器１１に送る。ゲート制御部１５は、断線信号ＯＦＦがＨレベルである場合には、電力変換器１１が備えるスイッチング素子をオフにするゲート指令ＧＡＴＥを電力変換器１１に送る。電力変換器１１が備えるスイッチング素子をオフにすることで、交流電動機４への電力供給が停止し、交流電動機４に過負荷がかかるのを防止することが可能となる。 When the disconnection signal OFF is at the L level, the gate control unit 15 switches the switching element included in the power converter 11 on and off based on the d-axis voltage command value Vd * and the q-axis voltage command value Vq *. Is sent to the power converter 11. When the disconnection signal OFF is at the H level, the gate control unit 15 sends a gate command GATE for turning off the switching element included in the power converter 11 to the power converter 11. By turning off the switching element included in the power converter 11, the power supply to the AC motor 4 is stopped, and it is possible to prevent the AC motor 4 from being overloaded.
　断線検知部１４が、電力変換器１１と交流電動機４との間で断線が生じているか否かを判断する動作について以下に説明する。図２は、実施の形態におけるモータ電圧とモータ電流との関係を示す図である。Ｕ相、Ｖ相及びＷ相の電圧の合成ベクトルの絶対値をモータ電圧という。また相電流Ｉｕ、Ｉｖ、Ｉｗの合成ベクトルの絶対値をモータ電流という。実際のモータ電圧を検出することはできないため、ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊の合成ベクトルの絶対値をモータ電圧とみなす。 An operation in which the disconnection detection unit 14 determines whether or not a disconnection has occurred between the power converter 11 and the AC motor 4 will be described below. FIG. 2 is a diagram illustrating a relationship between the motor voltage and the motor current in the embodiment. The absolute value of the combined vector of the U-phase, V-phase, and W-phase voltages is called a motor voltage. The absolute value of the combined vector of the phase currents Iu, Iv, and Iw is called a motor current. Since the actual motor voltage cannot be detected, the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * is regarded as the motor voltage.
　図２に示すように、交流電動機４の始動直後は、モータ電流は一定に保たれ、車両速度がある速度を超えると、車両速度が増すにつれて徐々に減少する。交流電動機４の始動後、モータ電圧は徐々に増加していき、リミット電圧に達すると、一定に保たれる。リミット電圧は、電力変換器１１が出力することができる電圧の最大値によって決定される値である。 As shown in FIG. 2, immediately after the AC motor 4 is started, the motor current is kept constant, and when the vehicle speed exceeds a certain speed, it gradually decreases as the vehicle speed increases. After the AC motor 4 is started, the motor voltage gradually increases and is kept constant when the limit voltage is reached. The limit voltage is a value determined by the maximum value of the voltage that can be output by the power converter 11.
　断線検知部１４は、交流電動機４の始動からモータ電圧がリミット電圧に到達するまでの間において、モータ電圧が所定範囲にない状態が、所定時間以上継続した場合には、電力変換器１１と交流電動機４との間で断線が生じていると判断する。図３は、実施の形態における電圧指令値の合成ベクトルの絶対値の所定範囲の例を示す図である。図３の実線で示す値以下であって０より大きい範囲を所定範囲とする。 When the state where the motor voltage is not within the predetermined range continues for a predetermined time or longer from the start of the AC motor 4 until the motor voltage reaches the limit voltage, the disconnection detection unit 14 and the AC converter 4 and the AC It is determined that a disconnection has occurred with the electric motor 4. FIG. 3 is a diagram illustrating an example of a predetermined range of absolute values of a combined vector of voltage command values in the embodiment. A range that is equal to or less than the value indicated by the solid line in FIG.
　図１に示すように、１つの制御装置１が複数の交流電動機４を駆動する場合であって、例えば１つの交流電動機のＵ相のケーブルが断線した場合には、電流検出部１２ａが検出する相電流Ｉｕは一時的に減少する。制御装置１は、交流電動機４に供給する電流が一定となるようベクトル制御を行うため、ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊の値が大きくなる。その後ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊の合成ベクトルの絶対値が所定範囲にない状態が、所定時間以上継続した場合には、断線検知部１４は、電力変換器１１と交流電動機４との間で断線が生じていると判断する。 As shown in FIG. 1, when one control device 1 drives a plurality of AC motors 4, for example, when a U-phase cable of one AC motor is disconnected, the current detection unit 12 a detects it. The phase current Iu temporarily decreases. Since control device 1 performs vector control so that the current supplied to AC motor 4 is constant, the values of d-axis voltage command value Vd * and q-axis voltage command value Vq * increase. Thereafter, when the state where the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * is not within a predetermined range continues for a predetermined time or longer, the disconnection detection unit 14 is connected to the power converter 11. It is determined that a disconnection has occurred with the AC motor 4.
　図３において黒丸で示すように、車両の速度がＶ１でモータ電圧がＶｍ１である場合には、モータ電圧が所定範囲にある。この場合には、断線検知部１４は、電力変換器１１と交流電動機４との間に断線が生じていないと判断する。図３において白丸で示すように、車両の速度がＶ２でモータ電圧がＶｍ２である場合には、モータ電圧が所定範囲にない。この状態が所定時間以上継続した場合には、断線検知部１４は、電力変換器１１と交流電動機４との間に断線が生じていると判断する。 As shown by black circles in FIG. 3, when the vehicle speed is V1 and the motor voltage is Vm1, the motor voltage is within a predetermined range. In this case, the disconnection detection unit 14 determines that no disconnection has occurred between the power converter 11 and the AC motor 4. As indicated by white circles in FIG. 3, when the vehicle speed is V2 and the motor voltage is Vm2, the motor voltage is not within a predetermined range. When this state continues for a predetermined time or more, the disconnection detection unit 14 determines that a disconnection has occurred between the power converter 11 and the AC motor 4.
　所定範囲の上限値は、例えば図３において点線で示す非断線時のモータ電圧にある定数を乗算した値とする。また所定範囲の上限値と非断線時のモータ電圧との差が車両の速度の増加に伴って一定の割合で増加するように、所定範囲の上限値を定義してもよい。 The upper limit value of the predetermined range is, for example, a value obtained by multiplying a constant in the motor voltage when there is no disconnection indicated by a dotted line in FIG. Further, the upper limit value of the predetermined range may be defined so that the difference between the upper limit value of the predetermined range and the motor voltage at the time of disconnection increases at a constant rate as the vehicle speed increases.
　断線検知部１４は、ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊の合成ベクトルの絶対値に基づき、電力変換器１１と交流電動機４との間が断線しているか否かを判断するため、１つの交流電動機４の全ての相のケーブルが断線した場合でも、断線を検知することが可能である。また全ての交流電動機４の全ての相のケーブルが断線した場合には、ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊の合成ベクトルの絶対値が０になるため、所定範囲に０を含まないようにすることで、そのような場合でも断線を検知することが可能である。 The disconnection detector 14 determines whether or not the power converter 11 and the AC motor 4 are disconnected based on the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq *. Therefore, even when the cables of all the phases of one AC motor 4 are disconnected, it is possible to detect the disconnection. When the cables of all the phases of all the AC motors 4 are disconnected, the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * becomes 0, so that 0 in a predetermined range. In such a case, it is possible to detect a disconnection.
　交流電動機４の始動後のモータ電圧の上昇の仕方は、運転指令信号Ｓ１の種類によって異なるので、所定範囲を運転指令ごとに定義してもよい。 Since how the motor voltage increases after the AC motor 4 is started varies depending on the type of the operation command signal S1, a predetermined range may be defined for each operation command.
　図４は、実施の形態における運転指令に対応する所定範囲の例を示す図である。例えば運転指令信号Ｓ１がパターン１である場合、パターン２である場合のそれぞれに対応する所定範囲を定義する。運転指令信号Ｓ１には、例えば無段階の力行指令信号や段階的な力行指令信号などの種類がある。図４において、一点鎖線のグラフが運転指令信号Ｓ１がパターン１である場合の所定範囲の上限値であり、二点鎖線のグラフが運転指令信号Ｓ１がパターン２である場合の所定範囲の上限値である。運転指令信号Ｓ１がパターン１であり、車両の速度がＶ３でモータ電圧がＶｍ３である場合には、断線検知部１４は、電力変換器１１と交流電動機４との間に断線が生じていないと判断する。 FIG. 4 is a diagram illustrating an example of a predetermined range corresponding to the operation command in the embodiment. For example, when the operation command signal S1 is the pattern 1, a predetermined range corresponding to each of the case where the operation command signal S1 is the pattern 2 is defined. The operation command signal S1 includes, for example, a stepless power running command signal and a stepped power running command signal. In FIG. 4, the one-dot chain line graph is the upper limit value of the predetermined range when the operation command signal S1 is the pattern 1, and the two-dot chain line graph is the upper limit value of the predetermined range when the operation command signal S1 is the pattern 2 It is. When the operation command signal S1 is pattern 1, the vehicle speed is V3, and the motor voltage is Vm3, the disconnection detection unit 14 indicates that there is no disconnection between the power converter 11 and the AC motor 4. to decide.
　一方、運転指令信号Ｓ１がパターン２であり、車両の速度がＶ３でモータ電圧がＶｍ３である場合には、断線検知部１４は、電力変換器１１と交流電動機４との間に断線が生じていると判断する。運転指令に対応する所定範囲を定義することで、電力変換器１１と交流電動機４との間における断線の検知精度を向上させることが可能となる。 On the other hand, when the driving command signal S1 is pattern 2, the vehicle speed is V3, and the motor voltage is Vm3, the disconnection detection unit 14 has a disconnection between the power converter 11 and the AC motor 4. Judge that By defining a predetermined range corresponding to the operation command, it is possible to improve the disconnection detection accuracy between the power converter 11 and the AC motor 4.
　以上説明したとおり、本実施の形態に係る制御装置１によれば、簡易な構成で電力変換器と電動機との間における断線の検知精度を向上させることが可能となる。 As described above, according to the control device 1 according to the present embodiment, it is possible to improve the detection accuracy of the disconnection between the power converter and the electric motor with a simple configuration.
　断線検知部１４は、運転指令信号Ｓ１を用いないように構成してもよい。その場合には、運転指令信号の種類によらず、ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊の合成ベクトルの絶対値が定めた所定範囲にない状態が所定時間以上継続した場合に、電力変換器１１と交流電動機４との間で断線していると判断する。 The disconnection detection unit 14 may be configured not to use the operation command signal S1. In that case, when the state where the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * is not within the predetermined range is continued for a predetermined time or more regardless of the type of operation command signal. In addition, it is determined that the power converter 11 and the AC motor 4 are disconnected.
　また断線検知部１４は、電力変換器１１と交流電動機４との間で断線していると判断した場合には、断線信号ＯＦＦをゲート制御部１５ではなく制御装置１の外部に出力するよう構成してもよい。例えば断線信号ＯＦＦを運転台の表示装置に送り、運転手に電力変換器１１と交流電動機４との間で断線していることを通知するよう構成してもよい。 Further, the disconnection detection unit 14 is configured to output a disconnection signal OFF to the outside of the control device 1 instead of the gate control unit 15 when it is determined that the disconnection has occurred between the power converter 11 and the AC motor 4. May be. For example, a disconnection signal OFF may be sent to the display device of the cab and the driver may be notified that the power converter 11 and the AC motor 4 are disconnected.
　交流電動機４は、三相誘導電動機に限られず、単相誘導電動機であってもよい。また交流電動機４は複数個に限られず、１つでもよい。交流電動機４は、誘導電動機でもよいし、回転電動機でもよい。また交流電動機４の代わりに、リニア誘導電動機、リニア同期電動機、およびソレノイドなどを用いるよう構成してもよい。 AC motor 4 is not limited to a three-phase induction motor, and may be a single-phase induction motor. Further, the AC motor 4 is not limited to a plurality, and may be one. The AC motor 4 may be an induction motor or a rotary motor. Further, instead of the AC motor 4, a linear induction motor, a linear synchronous motor, a solenoid, or the like may be used.
　制御装置１が駆動する交流電動機４は、車両を走行させる駆動力を生じる電動機に限られない。所定範囲は、車両の速度の関数ではなく、交流電動機４の角速度の関数としてもよい。その場合、断線検知部１４に入力される速度信号Ｓ２は、交流電動機４の角速度である。そして断線検知部１４は、ｄ軸電圧指令値Ｖｄ＊およびｑ軸電圧指令値Ｖｑ＊の合成ベクトルの絶対値が、交流電動機４の角速度の関数である所定範囲にない状態が所定時間以上継続した場合に、電力変換器１１と交流電動機４との間で断線していると判断する。 AC motor 4 driven by control device 1 is not limited to an electric motor that generates a driving force for running a vehicle. The predetermined range may be a function of the angular speed of the AC motor 4 instead of a function of the speed of the vehicle. In that case, the speed signal S <b> 2 input to the disconnection detection unit 14 is the angular speed of the AC motor 4. The disconnection detection unit 14 continues the state where the absolute value of the combined vector of the d-axis voltage command value Vd * and the q-axis voltage command value Vq * is not within a predetermined range that is a function of the angular velocity of the AC motor 4 for a predetermined time or longer. In this case, it is determined that the power converter 11 and the AC motor 4 are disconnected.
　上記実施の形態は、いずれも本発明の趣旨の範囲内で各種の変形が可能である。上記実施の形態は本発明を説明するためのものであり、本発明の範囲を限定することを意図したものではない。本発明の範囲は実施形態よりも添付した請求項によって示される。請求項の範囲内、および発明の請求項と均等の範囲でなされた各種変形は本発明の範囲に含まれる。 Any of the above embodiments can be variously modified within the scope of the gist of the present invention. The above embodiments are for explaining the present invention, and are not intended to limit the scope of the present invention. The scope of the invention is indicated by the appended claims rather than the embodiments. Various modifications made within the scope of the claims and within the scope equivalent to the claims of the invention are included in the scope of the present invention.
　本発明は、電動機を駆動するために電力を変換する電力変換器を制御し、電力変換器と電動機との間の断線を検知する制御装置に好適に採用され得る。 The present invention can be suitably employed in a control device that controls a power converter that converts electric power to drive an electric motor and detects a disconnection between the power converter and the electric motor.
　　　　　　　　　　　１　　制御装置
　　　　　　　　　　　２　　架線
　　　　　　　　　　　３　　集電装置
　　　　　　　　　　　４　　交流電動機
　　　　　　　　　　１１　　電力変換器
　　１２ａ、１２ｂ、１２ｃ　電流検出部
　　　　　　　　　　１３　　電圧制御部
　　　　　　　　　　１４　　断線検知部
　　　　　　　　　　１５　　ゲート制御部 DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Overhead wire 3 Current collector 4 AC motor 11 Power converter 12a, 12b, 12c Current detection part 13 Voltage control part 14 Disconnection detection part 15 Gate control part

Claims (6)

  1. 　スイッチング素子のオンとオフを切り替えることにより、入力された電力を変換し、交流電動機を駆動する電力変換器と、
    　前記電力変換器が交流電動機に対して出力する電流を検出する電流検出部と、
    　前記交流電動機の回転動作を指令する運転指令および前記電流検出部が検出した前記電流に基づき、前記電力変換器の制御に用いる電圧指令値を生成する電圧制御部と、
    　前記電圧指令値の合成ベクトルの絶対値が所定範囲にない状態が、所定時間以上継続した場合には、前記電力変換器と前記交流電動機との間で断線が生じていると判断する断線検知部と、
    　前記電圧指令値に基づき、前記電力変換器が備える前記スイッチング素子のオンとオフの切り替えを制御するゲート指令を出力するゲート制御部と、
    　を備える制御装置。     A power converter that converts the input power by switching on and off the switching element and drives the AC motor;
    A current detection unit for detecting a current output to the AC motor by the power converter;
    A voltage control unit that generates a voltage command value used for control of the power converter, based on an operation command that commands the rotation operation of the AC motor and the current detected by the current detection unit;
    A disconnection detection unit that determines that a disconnection has occurred between the power converter and the AC motor when a state where the absolute value of the combined vector of the voltage command values is not within a predetermined range continues for a predetermined time or longer. When,
    Based on the voltage command value, a gate control unit that outputs a gate command for controlling on and off switching of the switching element included in the power converter;
    A control device comprising:
  2. 　前記断線検知部は、前記交流電動機の角速度を取得し、前記電圧指令値の合成ベクトルの絶対値が前記角速度の関数である前記所定範囲にない状態が、前記所定時間以上継続した場合には、前記電力変換器と前記交流電動機との間で断線が生じていると判断する請求項１に記載の制御装置。 The disconnection detection unit obtains the angular velocity of the AC motor, and when the state where the absolute value of the combined vector of the voltage command values is not in the predetermined range as a function of the angular velocity continues for the predetermined time or longer, The control device according to claim 1, wherein it is determined that a disconnection has occurred between the power converter and the AC motor.
  3. 　前記交流電動機は車両を走行させる駆動力を生じる電動機であって、
    　前記電圧制御部は、前記運転指令として、前記車両の走行を制御する運転指令を用い、
    　前記断線検知部は、前記車両の速度を取得し、前記電圧指令値の合成ベクトルの絶対値が前記車両の速度の関数である前記所定範囲にない状態が、前記所定時間以上継続した場合には、前記電力変換器と前記交流電動機との間で断線が生じていると判断する、
    　請求項１に記載の制御装置。     The AC motor is an electric motor that generates a driving force for running a vehicle,
    The voltage control unit uses a driving command for controlling the traveling of the vehicle as the driving command,
    The disconnection detection unit acquires the speed of the vehicle, and the state where the absolute value of the combined vector of the voltage command values is not in the predetermined range as a function of the speed of the vehicle continues for the predetermined time or longer. , Determining that a disconnection has occurred between the power converter and the AC motor;
    The control device according to claim 1.
  4. 　前記断線検知部は、前記運転指令に基づき、前記電圧指令値の合成ベクトルの絶対値が前記運転指令に対応する前記所定範囲にない状態が、前記所定時間以上継続した場合には、前記電力変換器と前記交流電動機との間で断線が生じていると判断する請求項１ないし３のいずれか１項に記載の制御装置。 The disconnection detection unit, based on the operation command, when the state where the absolute value of the combined vector of the voltage command value is not in the predetermined range corresponding to the operation command continues for the predetermined time or longer, the power conversion The control device according to any one of claims 1 to 3, wherein it is determined that a disconnection has occurred between a motor and the AC motor.
  5. 　前記ゲート制御部は、前記断線検知部が前記電力変換器と前記交流電動機との間で断線が生じていると判断した場合に、前記電力変換器が備える前記スイッチング素子をオフにする前記ゲート指令を出力する請求項１ないし４のいずれか１項に記載の制御装置。 The gate control unit is configured to turn off the switching element included in the power converter when the disconnection detection unit determines that a disconnection occurs between the power converter and the AC motor. The control device according to any one of claims 1 to 4, wherein:
  6. 　前記電力変換器は複数の三相電動機を駆動し、
    　前記電流検出部は、前記電力変換器が出力する三相それぞれの電流を検出する、
    　請求項１ないし５のいずれか１項に記載の制御装置。     The power converter drives a plurality of three-phase motors;
    The current detection unit detects the current of each of the three phases output by the power converter;
    The control device according to any one of claims 1 to 5.
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JPWO2014013614A1 (en) 2016-06-30

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